diff options
Diffstat (limited to 'arch/x86/lib/thunk_64.S')
| -rw-r--r-- | arch/x86/lib/thunk_64.S | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/arch/x86/lib/thunk_64.S b/arch/x86/lib/thunk_64.S new file mode 100644 index 000000000..f89ba4e93 --- /dev/null +++ b/arch/x86/lib/thunk_64.S @@ -0,0 +1,75 @@ +/* + * Save registers before calling assembly functions. This avoids + * disturbance of register allocation in some inline assembly constructs. + * Copyright 2001,2002 by Andi Kleen, SuSE Labs. + * Added trace_hardirqs callers - Copyright 2007 Steven Rostedt, Red Hat, Inc. + * Subject to the GNU public license, v.2. No warranty of any kind. + */ +#include <linux/linkage.h> +#include <asm/dwarf2.h> +#include <asm/calling.h> +#include <asm/asm.h> + + /* rdi: arg1 ... normal C conventions. rax is saved/restored. */ + .macro THUNK name, func, put_ret_addr_in_rdi=0 + .globl \name +\name: + CFI_STARTPROC + + /* this one pushes 9 elems, the next one would be %rIP */ + pushq_cfi_reg rdi + pushq_cfi_reg rsi + pushq_cfi_reg rdx + pushq_cfi_reg rcx + pushq_cfi_reg rax + pushq_cfi_reg r8 + pushq_cfi_reg r9 + pushq_cfi_reg r10 + pushq_cfi_reg r11 + + .if \put_ret_addr_in_rdi + /* 9*8(%rsp) is return addr on stack */ + movq_cfi_restore 9*8, rdi + .endif + + call \func + jmp restore + CFI_ENDPROC + _ASM_NOKPROBE(\name) + .endm + +#ifdef CONFIG_TRACE_IRQFLAGS + THUNK trace_hardirqs_on_thunk,trace_hardirqs_on_caller,1 + THUNK trace_hardirqs_off_thunk,trace_hardirqs_off_caller,1 +#endif + +#ifdef CONFIG_DEBUG_LOCK_ALLOC + THUNK lockdep_sys_exit_thunk,lockdep_sys_exit +#endif + +#ifdef CONFIG_PREEMPT + THUNK ___preempt_schedule, preempt_schedule +#ifdef CONFIG_CONTEXT_TRACKING + THUNK ___preempt_schedule_context, preempt_schedule_context +#endif +#endif + +#if defined(CONFIG_TRACE_IRQFLAGS) \ + || defined(CONFIG_DEBUG_LOCK_ALLOC) \ + || defined(CONFIG_PREEMPT) + CFI_STARTPROC + CFI_ADJUST_CFA_OFFSET 9*8 +restore: + popq_cfi_reg r11 + popq_cfi_reg r10 + popq_cfi_reg r9 + popq_cfi_reg r8 + popq_cfi_reg rax + popq_cfi_reg rcx + popq_cfi_reg rdx + popq_cfi_reg rsi + popq_cfi_reg rdi + ret + CFI_ENDPROC + _ASM_NOKPROBE(restore) +#endif |